Materials list, cost plan and WHS risk assessment

Do Now · 5 min

Count the members on your plan + elevation drawing from L08. Quick estimate:

• How many popsicle sticks for top + bottom chords? ___
• How many for verticals? ___
• How many for diagonals? ___
• Double it (you have TWO trusses + deck): ___

I Do · ~10 min Teacher demonstration

Teacher models a materials list using the exemplar bridge:

MATERIALS LIST — Bridge It (Team Bradfield)
Popsicle sticks (full length 114 mm)     × 90
Popsicle sticks (cut to 60 mm)           × 24
Popsicle sticks (cut to 40 mm diagonals) × 32
PVA wood glue                            150 g
Hot glue sticks                          3 × 7 mm
Masking tape (temp clamping)             1 m
TOTAL STICKS                             ~146 (add 20% contingency = 175)

Then a WHS risk table. Teacher introduces the risk matrix: Likelihood × Consequence = Risk Level.

HAZARD                        LIKELIHOOD   CONSEQUENCE   RISK    CONTROL
Scissor cut                   Medium       Low           Low     Cut away from body, pass handle-first
Hot glue burn                 Medium       Medium        Med     Teacher-supervised only, cool-down mat
PVA in eyes                   Low          Low           Low     Wash hands, cap bottles
Bridge failure hits student   Low          Low           Low     1 m exclusion zone during load test

We Do · ~15 min Guided practice

Together we plan a build schedule:

• L11 — WHS briefing + lay out + glue first base chord
• L12 — complete base chord + cut verticals
• L13 — glue diagonals (triangulation lesson)
• L14 — mirror truss (second side)
• L15 — deck
• L16 — peer review + one improvement
• L17 — reinforcement
• L18 — finishing

You Do · ~35 min Independent pair work

Complete Part A of your folio (30 min).

1. Write your MATERIALS LIST with quantities and total stick count.
2. Write your WHS RISK TABLE — minimum 4 hazards, controls, risk levels before & after.
3. Write your BUILD SCHEDULE — which build stage in which lesson.
4. Check your whole folio against the Part A checklist (on hub). Tick each row.
5. Save to Google Classroom draft folder — FORMATIVE CHECK-IN with Ms Gao (she'll mark up and return before Part A due date).

Differentiation

Exit Ticket · 5 min

1. Total stick count for your bridge?
2. Most serious WHS risk in your build?
3. Which lesson is your build SCHEDULED to finish?

📚 Resources for this lesson

• Materials list template
• WHS risk matrix explainer
• Part A checklist

Before you leave Quick check-in